1 Department of Microbial Pathogenesis, Yale University School of Medicine, New Haven, CT, 06536, USA.
2 Glycobiology Research and Training Center, Departments of Medicine, Pathology and Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA, 92093, USA.
3 Department of Chemistry, University of California Davis, Davis, CA, 95616, USA.
4 Department of Microbial Pathogenesis, Yale University School of Medicine, New Haven, CT, 06536, USA. jorge.galan@yale.edu.
The original version of this Letter has been modified in the abstract and main text to better reflect the distribution of Neu5Ac sialoglycans in humans. Additionally, co-author Lingquan Deng's present address has been further clarified.